Description: Precovery and recovery of new asteroids or comets from the Mega Archive (15 million images by Mar 2018).
Input: Astrometric observations of a new asteroid or comet (only one object, in MPC format).
Output: List of images probably showing serendipitous encounters of the object.
Using: The OrbFit Software Package (OrbFit Consortium - A. Milani et al, 2017) installed locally.
Note: OrbFit is unstable to run new multi-observations orbits, thus we accommodate two multi-step models.

Reference: Please include the following two acknowledgements in any publication using this service:
- Quote this paper: Vaduvescu, O. et al., 2017 AN 334, 718.
- Include in the acknowledgement: "This paper used the EURONEAR Mega Precovery V.3 \footnote{http://www.euronear.org/tools/megaprecovery.php}".